<?php 
if (isset($captchaError) ){
echo $captchaError;
}
?>
<form action="" method="post">

<p>Nome<br>
<input type="text" name="nome"></p>
<p>Comentario<br>
<textarea name="text" rows="10" cols="50"></textarea>

</p>
<?php echo recaptcha_get_html($publickey); ?>
<input type="submit" name="submit" value="Enviar">
</form>